This one happened last year. Judging by the comments, a lot of teachers "coach" the kids in their Thanksgiving pictures, so that made me feel a bit better!
I thought it would be cute to get our 7yo to draw Vincent's picture so I found a printable online and got him to fill it in:

I retouched it a little to make it clearer for the comic. The rest was pretty simple because I got to recycle quite a bit of linework from previous comics.